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new features: follow-symlinks, rename-exdev, link-exdev

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* follow-symlinks: allows mergerfs to transparently follow symlinks
* link-exdev: in the event a link returns EXDEV create a symlink instead
* rename-exdev: in the event a rename returns EXDEV move the oldpath and
  create a symlink for the newpath
This commit is contained in:
Antonio SJ Musumeci 2020-06-21 14:45:14 -04:00
parent 50daf84ec0
commit 8adebc9489
26 changed files with 6980 additions and 450 deletions
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58
src/config_link_exdev.cpp Normal file
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/*
ISC License
Copyright (c) 2021, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config_link_exdev.hpp"
#include "ef.hpp"
#include "errno.hpp"
template<>
std::string
LinkEXDEV::to_string(void) const
{
switch(_data)
{
case LinkEXDEV::ENUM::PASSTHROUGH:
return "passthrough";
case LinkEXDEV::ENUM::REL_SYMLINK:
return "rel-symlink";
case LinkEXDEV::ENUM::ABS_BASE_SYMLINK:
return "abs-base-symlink";
case LinkEXDEV::ENUM::ABS_POOL_SYMLINK:
return "abs-pool-symlink";
}
return "invalid";
}
template<>
int
LinkEXDEV::from_string(const std::string &s_)
{
if(s_ == "passthrough")
_data = LinkEXDEV::ENUM::PASSTHROUGH;
ef(s_ == "rel-symlink")
_data = LinkEXDEV::ENUM::REL_SYMLINK;
ef(s_ == "abs-base-symlink")
_data = LinkEXDEV::ENUM::ABS_BASE_SYMLINK;
ef(s_ == "abs-pool-symlink")
_data = LinkEXDEV::ENUM::ABS_POOL_SYMLINK;
else
return -EINVAL;
return 0;
}